Just a heads up that use can use the (free) add-on Firebug for Firefox to isolate elements such as this. Josh Lobe has some useful You-tube tutorials on how to use Firebug. Ken also has an article on his blog, which can be found here.

Ah that worked, I located where the custom CSS entry was in the Graphene options and added it there and it worked, thanks. Thanks for the heads up on Firebug also, maybe one day I'll have sufficient knowledge to use it.